Probably the most silly question in the world, but I need help ;-)

I am encountering a problem in removing short hair to Michael 4 (while keeping materials as skin color, body hair, eyes and so on). With Victoria 4 there is not problems but with Michael 4 I don't understand how I can do it.
Well if I do apply the Aged for M4 (I also own Aged for M4 and M4 Morphs ++) the hair is removed but also the textures(materials do change obviously. What I need is to keep the original textures/materials, and removing that short hair from head.

I am sorry, just an additional small question. As you can see, after having applied the material, the skin of Michael became very tanned. Is there a way to make it clearer that is the same of the original Michael 4?

I can't tell from your screenshots, but maybe your original Michael textures could have been using the "Daz Studio Default" shader, while applying the new hi-res textures might switch you over to the Omnifreaker Human Surface Shader or the Elite Surface Shader.

If you look at the top of the Surfaces tab it should have "Daz Studio Default" or "omHumanSurface" or something to that effect.

Other shaders will have different spec, diffuse and other qualities, plus (possibly) activate properties like Velvet, translucency and sss, all of which can affect how the surface appears.

Fixed: it was just a problem of Ambient Strenght Setting value. While original Michael 4 loads an Ambient Strenght Value of 14,5%, the New Skin Map sets back the value to 0 and so the character looks tanned. Thank you very much!

And if you add new light , then render, the specular map make more realistick effect for your actor.
I suggest, you just add new light and , rotate right,
then adjust diffuse strength, specular strrength, and glosyness to get the effect (which you really need.:)
though you can remove all specular map, and adjust specular strength , glossiness as same as Sample-Res specular effect,,